Solenoid.



F. KRAEMER.

SOLENOID.

APPLICATION FILED MAILZI. Isls.

1,208,577'. I Patented De@.12,1916.

@f2 N @j IIIIIIIIIIII I UniTED STATES PATENT onnicn.

BY DIRECT 'AND MESNE. MILWAUKEE,

FRANK KBAEMER, OF MILWAUKEE, NTISCONSIN, ASSIGNOB,

ASSIGNMENTS, T0 PAN-AMERICAN ELECTRIC TOOL COMPANY, OF WISCONSIN, A CORPORATION 0F WISCONSIN.

SOLENOID.

Specicationpf Letters Patent. Patente De@ 12,` 1916 Application filed March 27, 1918. Serial No. 86,890.

sleeves 2, preferably of dielectric material such as vulcanized fiber bent to cylindrical form lto loosely surround the core 1. The edges of the sleeves 2 are slitted, as indicated in Figs. 2 and 3, to form tabs 3 which are turned outwardly and engage the outer To all whom t may concern:

Be it known that I, FRANKKRAEMER, a citizen of the United States, residing at Mil- Waukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Solenoids,A

of wli'ich'the following is a specification. faces of annular members 4, preferabl of This invention relates to a solenoid adaptdielectric material such as vulcanized ber. ed for a variety of uses. The annular members 4, together with the sleeves 2, form spools which support conductors -5 disposed thereabout and the spools, together with the conductors 5, form mechanically independent ctions ofl the solenoid, the conductors 5 being electrically connected between the sections. The sec- Solenoids have heretofore been constructed as a unit comprising a plurality of turns of conducting material arranged upon a suitable core. Inasmuch as considerable heat is generated, owing to the resistance of the conducting material, when the solenoid is in use, the expansion which results from the heat generated has frequently disrupted solenoids of this character because of ythe different coeflicients of expansion of the materials necessarily employed in their construction. rIhe use of solenoids, and particularly those requiring an inclosing casing, has, therefore, been limited.

It is an object of my invention to provide a solenoid in which the inequalities in expansion due to the heat produced during the use thereof and to the dierent coefficients of expansion of the materials employed therein are neutralized.

A further object of my invention is the provision of a solenoid which isl composed of mechanically independent units inclosed within a suitable casing and which permits of individual expansion of the separateV units without affecting the solenoid structure as a whole.

Further objects and advantages of my invention will be apparent as it is better understood by reference to the following able separators lar members 4 which may suitable material such as rubber.

Disposed about and inclosing the sections is a casing 7 preferably of metal, to the ends 7of which the caps 8 are threadedly connected. Between the caps bers 9 of rubber or other suitable material which permit the sections to be resiliently clamped within the casing 7 In Fig. 4 of the drawin I have illustrated a slightly different form of my yinvention in which the annular members 10, preferably of dielectric material such as vulcanized fiber, are loosely a core 11, preferably of the same material, and spaced from each other by means o suitable separators 12. Conductors 1 are disposed about the core 11 between the annular members 10 an'd are electrically connected therebetween. A casing 14,'preferably of metal, surrounds and incloses the sections forme by the conductors 13 and specification when read in connection with the accompanying drawing, illustrating the caps 15 threadedly engage the ends of the preferred embodiment thereof, in whichcasing 14, resilient ,material 16 being disposed between the caps 15 and the adpicent annular members 10 whereby the sections forming the solenoid are resiliently `clamped within the casing 14.

From the foregoin it will be apparent that I have perfecte a solenoid composed of a plurality of mechanically independent sections which are free to expand inde- Figur'e 1 is a longitudinal section through a solenoid according to my invention; Fig. 2 is a transverse section on the line 2--2 of Fig. 1; Fig. 3 is a'view in perspective of'one of the solenoid lements, and Fi 4 is a lonitudinal section through a s ightly diferent form of my invention.

Referring to the drawings, 1 indicates a suitable core preferably of dielectric mapendently of the core' and casing and which, terial such as` vulcanized fiber which is therefore, can not disrupt the solenoid by adapted to support the mechanically in deexpansion under the influence of high tempcratures produced under Lheavy lserviceconpendent elements of the solenoid comprising mounted upon- 8 and the adjacent annular members 4 I preferably insert meinc@ neet-2,577

ditions. lt, therefore, becomes possible to utilize solenoids for many purposes for which they have not heretofore been adapted and particularly to uses requiringthe solenoid to be protected Within a metallic easing. v

llt Will beapparent that various changes may be made in the form, construction and arrangement of the parts Without departing' :from the spirit and Scope of the invention or sacrificing any of its material advantages., the form herenbefore described being nierely a preferred embodiment thereof.

l claim:

A solenoid comprising a hollow core of non-magnetic material, a

plurality of mechanically independent sections arranged end to end on said core, each of said sections including an electrical conductor and the conductors of said sections being electrically connected, resilient spacing means between said sections, a metal casing inclosing said sections, and means connected to said casing for rigidly clamping said sec'- tions and core in assembled relation Within Said casing.

FRANK KRAEMER.

Witnesses:

JULIAN/ULDs,

el. A. DIETRICH. 

